ASoC: wm8994: Defer declaration of open circuit microphones

Provide a bit of debounce to handle pathological cases with slow input
better by allowing the microphone detection to run for a bit longer.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 32 insertions, 9 deletions

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 0805d6ff9ff7..2c2a183da2b6 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -3513,6 +3513,31 @@ static void wm8958_button_det(struct snd_soc_codec *codec, u16 status)
                             wm8994->btn_mask);
 }
 
+static void wm8958_open_circuit_work(struct work_struct *work)
+{
+        struct wm8994_priv *wm8994 = container_of(work,
+                                                  struct wm8994_priv,
+                                                  open_circuit_work.work);
+        struct device *dev = wm8994->wm8994->dev;
+
+        wm1811_micd_stop(wm8994->hubs.codec);
+
+        mutex_lock(&wm8994->accdet_lock);
+
+        dev_dbg(dev, "Reporting open circuit\n");
+
+        wm8994->jack_mic = false;
+        wm8994->mic_detecting = true;
+
+        wm8958_micd_set_rate(wm8994->hubs.codec);
+
+        snd_soc_jack_report(wm8994->micdet[0].jack, 0,
+                            wm8994->btn_mask |
+                            SND_JACK_HEADSET);
+
+        mutex_unlock(&wm8994->accdet_lock);
+}
+
 static void wm8958_mic_id(void *data, u16 status)
 {
         struct snd_soc_codec *codec = data;
@@ -3522,16 +3547,9 @@ static void wm8958_mic_id(void *data, u16 status)
         if (!(status & WM8958_MICD_STS)) {
                 /* If nothing present then clear our statuses */
                 dev_dbg(codec->dev, "Detected open circuit\n");
-                wm8994->jack_mic = false;
-                wm8994->mic_detecting = true;
-
-                wm1811_micd_stop(codec);
 
-                wm8958_micd_set_rate(codec);
-
-                snd_soc_jack_report(wm8994->micdet[0].jack, 0,
-                                    wm8994->btn_mask |
-                                    SND_JACK_HEADSET);
+                schedule_delayed_work(&wm8994->open_circuit_work,
+                                      msecs_to_jiffies(2500));
                 return;
         }
 
@@ -3812,6 +3830,8 @@ static irqreturn_t wm8958_mic_irq(int irq, void *data)
         if (!(snd_soc_read(codec, WM8958_MIC_DETECT_1) & WM8958_MICD_ENA))
                 return IRQ_HANDLED;
 
+        cancel_delayed_work_sync(&wm8994->open_circuit_work);
+
         pm_runtime_get_sync(codec->dev);
 
         /* We may occasionally read a detection without an impedence
@@ -3911,6 +3931,8 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
         mutex_init(&wm8994->accdet_lock);
         INIT_DELAYED_WORK(&wm8994->jackdet_bootstrap,
                           wm1811_jackdet_bootstrap);
+        INIT_DELAYED_WORK(&wm8994->open_circuit_work,
+                          wm8958_open_circuit_work);
 
         switch (control->type) {
         case WM8994:
diff --git a/sound/soc/codecs/wm8994.h b/sound/soc/codecs/wm8994.h
index 55ddf4d57d9b..9d19a9185d35 100644
--- a/sound/soc/codecs/wm8994.h
+++ b/sound/soc/codecs/wm8994.h
@@ -134,6 +134,7 @@ struct wm8994_priv {
         struct mutex accdet_lock;
         struct wm8994_micdet micdet[2];
         struct delayed_work mic_work;
+        struct delayed_work open_circuit_work;
         bool mic_detecting;
         bool jack_mic;
         int btn_mask;